Move widevine unit tests to vendor.

Test: BOARD_VNDK_VERSION=current m checkbuild -j
Test: ./build_and_run_all_tests.sh

Bug: 33241851
Change-Id: I97c8fcc84bc19d88e8aa941eb283089c8ecf47d5

libwvdrmengine/cdm/test/unit-test.mk

@@ -55,6 +55,8 @@ LOCAL_MODULE_OWNER := widevine
 # When built, explicitly put it in the DATA/bin directory.
 LOCAL_MODULE_PATH := $(TARGET_OUT_DATA)/bin
 
+LOCAL_PROPRIETARY_MODULE := true
+
 ifneq ($(TARGET_ENABLE_MEDIADRM_64), true)
 LOCAL_MODULE_TARGET_ARCH := arm x86 mips
 endif